Sight for firearms.



No. 629m. Patented July 2S, |399. s. nunnENBEnaEn.

SIGHTFOR FIBEAH'MS.

(Application led Jan. 1.8, 1899.)

(N0 Mdel.)

WITNESSES:

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mi NoRRls s co I Punauwm wAsHmGToN, n. c.

UNITED STATES PATENT Orrice.

GEORGE DURRENBERGER, OF MIDDLEFIELD, CONNECTICUT, ASSIGNOR TO LYMAN A. MILLS, OF SAME-PLACE, EXECUTOR OF WILLIAM LYMAN,

DEoEAsED.

SIGHT FORFIREARMS.

SPECIFICATION forming part of Letters Patent No. 629,671, dated July 25, 1899.

Application iiled January 16. l 899.

T0 all whom, it may concern.-

Be it known that l, GEORGE DUERENBEE- GER, acitizen of the United States, residing in the town of Middlefield, in the county of .MiddleseX, in the State of Connecticut, have invented certain new and useful Improvements in Sights for Firearms, of which the following is a specification.

My invention relates to an improvement in rear sights for firearms of the class in which a sight-post bearing a vertically-adjustable sight-shank is hinged to a mounting secu red upon the tang or stock of vthe firearm and adapted for being folded down from the vertical position when not in use for the sake of greater compactness and less risk of injury to the mechanism while being handled in transportation. i

The invention has for its object to provide a construction of sight-post which shall be held stifiiy and rigid in its bearings at all positions and free from play or looseness, which, as is well known, subjects the sight to inaccuracy,which is multiplied with the height of the sight above the sight-post or leverage thereof and increases rapidly with the wear ofv the parts. Also, it is the purpose of the improvement to render the mechanismy sim ple of construction and adapted to be easily assembled and with parts of great durability and not liable to become out of order in use.

The invention consists in the novel construction of the sight-post and its adjustable the tang or stock. Fig. 3 is a rear elevationV of the parts as shown in Fig. 2. Fig. 4 is a rear elevation of ythe sight-post and sightshank Iitted therein, the adjusting-sleeve being removed to show the construction. Fig.

Serial No. 702,205. (No model.)

from the sighting mechanism. Fig. 9 isa plan 55 or upper end view of the holding-nut.- Fig. 10 is a plan or upper end viewA of the sight with the sight taken in section on the line a z, Fig. 2. Fig. ll is a' View of the holdingspring or elastic pawl, and Fig. l2 is a vor- 6c tical section of the adjusting-nut.

Referring to the drawings, A designates the base or mounting, adapted to be securedto the tang or stock of the gun and provided with the ears a', forming one part of the hinge- 65 joint. Between said ears is fitted the eye b' of the sight-post, and a bolt or pin d', passed through the said eye and the ears a', serves to pivot or hinge the parts together. This portion of the sight is old and well known, 7o

which here requires no further description.

The sight-post B has a rectangular groove or way d, extending from the perforation b2 of the eye h' to the upper end of the post and opening or cutting through on the rear side thereof, as shown.

In said groove is fitted a sight-shank E of rectangular cross-section, having a rack e, with inclined teeth, forming a part of the circumference of a screw upon its rear edge or side corresponding to the open- 8o ing of the groove d. The sight-post is cylindrical and of differential diameter7 the lower portion being of the same diameter as the eX- terual surface of the thread of which the rack e is a part and the upper portion j" beingvof the same diameter as the base of said thread or bottom of the spaces betweenthe teeth of the rack-that is to say, the diiference of the diameters on each side of the post corresponds to the height of the thread or teeth of the 9o rack. The rack therefore projects from the groove d in-the upper part j", but is received entirely within the groove in the lower part f of the post.

At the base of the cylindrical part fis a shoulderg, interior to a rim g', surrounding the same except on the side of the groove d. The upper end of the part f' is threaded to receive a nut h, having a groove 71, at one side of its perforation for engaging the pro- Io'o jecting part or rack of the sight-shank. Received on the post between the said shoulder g and nut 7i is a sleeve K, having its outer cylindrical surface suitably nurled to adapt it to be operated and read-ily turned on its bearings. The lower part K of the sleeve is bored to fit the largest part fot the sight-post, and the upper part 7a2 of the sleeve is internally threaded to engage the teeth of the rack e', its inner diameter or face of the threads 7c3 corresponding to the diameter of the upper part f' of the sight-post. The threads of the adjusting nut or sleeve K and the holdingnut h are preferably of opposite lead or pitch, as here shown, the rack and sleeves having right-handed threads and the holdin g-nut and threaded part of the sight-post left-hand threads, which insures the following result, vizrWhen the adjusting-nutis turned in the direction which brings its thrust against the holdingnut, the friction thereon tends to screw the holding-nuton instead of off. Consequently if the nut his fitted against a shoulderor screwed tightly to place, with its groove t' in alinement with the groove d of the sightpost, there will be no tendency in operation to turnthe nut and impose lateral friction on the rack.

The lower end of lthe adjusting nut or sleeve is reduced to fit within the rim g', and such reduced parti is provided with a series of indentations or ratchet depressions m, here numbering four and spaced ninety degrees apart around the circumference, as shown in Fig. 6. In the groove d where it cuts through the side of the eye b is arranged a iiat spring n, having its lower end bent to fit under a pin r, driven through the eye h across the groove d and forming a support, fastening, and fulcruni for the spring. The upper end of the spring bears against the reduced part z' of the adjusting-nut with a slight tension and is provided with a tooth 't for engaging the depressions'm, thereby forming a spring-panel for holding the nut in place, while permitting it to be readily turned on the post in operation. The upperend 2l of the adjusting-nut is turned smooth and graduated to show its position with reference to a zero-mark it on the nut 77, in fractional parts of a revolution, and the sight-shank is graduated, as shown at 22 in Fig. l, to indicate the elevation of the sight-aperture vw on the upper end thereof above the end of the sight-post or upper face 23 of the nut lt as al zero-point.

In operation the rotation of the adjustingnut iu the sight-post between its holdingshoulders accomplishes the elevation or depression of the sight-shank with ease, and when lack of light renders the indicating graduation obscure the amount of the adjustment may be determined by counting the clicks made bythe spring-pawl n as its tooth t snaps into the ratchet depression of the part t.

It will be observed that the rectangular cross-sectional conguration of the sightshank and its bearing in the sight-post render it very firm and rigid in its seat, both against twisting and wabbling motion,and the construction therewith of the sight-post having the enlarged base portion f' for strengthening the same forms an exceedingly strong, simple, durable, and compact sight, the parts of which may be easilyasscmbled and are n'ot liable to become out of order.

I claim as my invention and desire to secure by Letters Patentl. In sights for firearms the'combination of a sight-post adapted for mount-ing upon the firearm, and having its upper part cylindrical and provided with a longitudinal groove of rectangular cross-section opening on one side thereof and a thrust-shoulder at the base of said cylindrical part a'holding-nut screwed upon the upper end of said cylindrical part a sight-shank of rectangular cross-section fitting said groove and having a screw-threaded edge or inclined toothed rack projecting from the groove in the post, an internally-threaded adjusting-sleeve journaled on the cylindrical bearing of the sight-post between the said thrust-shoulder and holding-nut and intermeshing with the screw-rack, and a springpawl mounted on the sight-post and bearing upon the said adjusting-sleeve, the sleeve bcing provided with depressions for being engaged by the spring to hold the sleeve from turning, substantially in the manner and for the purpose specified.

2. In sights for firearms the combination of a base, a sight-post hinged thereto, having a cylindrical bearing of differential diameter, the upper portion thereof being of less dialneter than the base, and the post having alongitudinal parallel-sided groove opening on one side of the bearing, a sight-shank fitted in said groove and provided with a rack or threaded edge projecting from the groove in the reduced portion of the bearin g, an adjusting-sleeve journaled on said bearing, having a cylindrical lower part fitting the base thereof, and a smaller internally-threaded upper part received upon the reduced upper part of the bearing, with its threads engaging the teeth or thread of the rack, and means forsecurin g the sleeve against endwise motion upon its bearing, substantially in the manner and for the purpose speciiied.

3. In sights for firearms the combination of a base, a sight-post pivoted thereon, having the cylindrical bearings and of differential diameters, the shoulder and the longitudinal groove opening on the side of the said bearings, the holding-nut screwed upon the upper end of the bearing, the parallel-sided sightshank fitting the said groove and provided with a screw-rack having the face and base of its teeth struck to arcs corresponding respectively to the circles of the greater and lesser diameters of the bearing, whereby said teeth are adapted to project beyond the smaller bearing and to be received within the larger bearing, an adj usting-sleeve j ournaled IOO IIO

In testmoy whereof have hereunto set my signature this 30th day of December, 1o A. D. 1898.

GEORGE DURRENBERGER.

Witnesses:

IRADELL L. 000K, ALFRED H. AUG-UR. 

